The first group of UN observers to monitor the truce in Syria arrived in Damascus. The mission includes six people who start their work on Monday, confirmed a spokesperson of the United Nations. 30 observers are to arrive in Syria under the resolution of the Security Council of the UN, but in the future their number may be increased to 200.

The official SANA news agency said Syria welcomed this deployment because it "has nothing to hide" while reiterating the charges about "terrorist groups financed and armed by foreign parties," which are responsible for violence in the country.

On the ground, according to the Syrian Observatory of Human Rights (SOHR), government forces killed five civilians, including three in Homs, in the most violent bombing since Thursday, reinforcing Western doubts over the regime's commitment.

Government forces also bombed a rebel town in the province of Idleb (northwest). The official SANA news agency, for its part, reported the death of a member of the security forces following a "terrorist" fire in Harem, in the province of Idleb.

"Again, I am very concerned about what is happening in Syria," said Sunday the United Nations Secretary General Ban Ki-moon.

Mr. Ban stressed the need that the Syrian government take all necessary measures in order to preserve the cessation of violence.

Since the start of the truce on Thursday at least 32 deaths were reported.